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		<td class="col0 leftalign"> « <a href="geda-gschem_ug-autonumbering.html" class="wikilink1" title="geda-gschem_ug-autonumbering.html">Autonumbering</a>  </td><td class="col1 centeralign">  <strong><a href="geda-gschem_ug.html" class="wikilink1" title="geda-gschem_ug.html">gEDA gschem User Guide</a></strong>  </td><td class="col2 rightalign">  <a href="geda-gschem_ug-printing.html" class="wikilink1" title="geda-gschem_ug-printing.html">Printing</a> » </td>
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<h2 class="sectionedit2"><a name="hierarchy" id="hierarchy">Hierarchy</a></h2>
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<p>
When a design has several repeating subcircuits, it can sometimes be useful to draw a schematic for the subcircuit, and then include that subcircuit multiple times in the design.  This creates a <em>hierarchy</em> of circuits.
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Subcircuit schematics are searched for in a <em>source library</em>, and use the “in-1” and “out-1” symbols to indicate which nets to make available as connections for the schematics that include them.  Each subcircuit has a symbol, which uses ”<code>source=</code>” <a href="geda-gschem_ug-attributes.html" class="wikilink1" title="geda-gschem_ug-attributes.html">attributes</a> to specify the subcircuit&#039;s schematic pages.
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<p><div class="notetip">See <a href="geda-gschem_ug-config.html" class="wikilink1" title="geda-gschem_ug-config.html">Configuring gschem</a> for details of how to control where gschem looks for subcircuit schematics.
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<p>
To add a subcircuit to a schematic, simply place the symbol representing it as a <a href="geda-gschem_ug-components.html" class="wikilink1" title="geda-gschem_ug-components.html">component</a> in the schematic as usual.  Subcircuits can in turn contain other subcircuits!
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To view the underlying schematic for a subcircuit component, <a href="geda-gschem_ug-selecting.html" class="wikilink1" title="geda-gschem_ug-selecting.html">select</a> it and use <strong>Hierarchy→Down Schematic</strong>.  Once finished editing the subcircuit&#039;s schematic, use <strong>Hierarchy→Up</strong> to return to the original schematic.
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